We conducted an experiment on the accuracy of sorting walnuts (Juglans regia L.) on a device originally intended for sorting legumes by size. In conducting the experiment, we compared sorting with two different rollers and sorting by hand. We studied how accurately and quickly a particular method sorted. We used roller one, equipped with a smaller whitworth spiral to move the material, and roller two, equipped with a larger whitworth spiral. The third method was manual sorting, where we sorted the walnuts by hand. The experiment was conducted with the same amount of walnuts (12 kg). The roller with the smaller spiral pitch had the best sorting accuracy, and in fact all measurements were within the size tolerances (no measurement deviated by more than 10%). The roll with the smaller whitworth spiral had more deviations. For this roller, two measurements were out of tolerance, indicating that the sample was not suitable for sale. When sorting by hand, the difference was seen in the sorting time. For 12 kg of walnus, we needed 22.51 minutes, which is on average 16.74 minutes longer than using the rollers (device). It can be concluded that a legume sorter used for sorting walnuts can sort them efficiently and quickly.
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